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Experimental support for dynamically loading templates. Low-level template handling is unchanged;
main programs call dlopen_templates() at appropriate times. If template set has changed, the old
one is unloaded first.
--- /dev/null
+++ b/shared/dlopen_templates.c
@@ -0,0 +1,34 @@
+#include <dlfcn.h>
+#include "shared.h"
+
+struct template_map_index template_map_index[] = {
+    {NIL, NIL, NIL},
+    {NIL, NIL, NIL}
+};
+
+struct template_map_index *
+dlopen_templates(const char *set, const char *suffix)
+{
+    struct template_map_index *tmi = &template_map_index[0];
+    static void *handle = 0;
+
+    if (!handle || strcmp(tmi->name, set)) {
+        char *filename = pool_printf(NIL, "/usr/lib/prayer/templates/%s%s.so",
+                                     set, suffix);
+
+        if (handle) {
+            dlclose(handle);
+            free(tmi->name);
+        }
+        tmi->name = pool_strdup(NIL, set);
+        if (!(handle = dlopen(filename, RTLD_NOW))
+            || !(tmi->template_map = dlsym(handle, "template_map"))
+            || !(tmi->count = dlsym(handle, "template_map_count"))) {
+            log_fatal("Failed to load template library: %s",
+                      dlerror());
+        }
+        log_debug("Loaded library %s with %d templates", filename, *tmi->count);
+        free(filename);
+    }
+    return tmi;
+}
--- /dev/null
+++ b/shared/dlopen_templates.h
@@ -0,0 +1 @@
+struct template_map_index *dlopen_templates(const char *set, const char *suffix);
--- a/templates/cam/Makefile
+++ b/templates/cam/Makefile
@@ -6,12 +6,16 @@ else
 include ../../Config
 endif
 
-CFLAGS  = $(BASECFLAGS)
-LDFLAGS = $(BASELDFLAGS)
+CFLAGS  = $(BASECFLAGS) -fPIC
+LDFLAGS = $(BASELDFLAGS) -fPIC
+LDFLAGS_TEMPLATELIB = \
+       -Wl,--defsym=template_map=template_map_$(TYPE) \
+       -Wl,--defsym=template_map_count=template_map_$(TYPE)_count
+LDFLAGS += $(LDFLAGS_TEMPLATELIB)
 
 TYPE=cam
 
-TARGETS=templates.a templates_frontend.a
+TARGETS=templates.a templates_frontend.a $(TYPE).so $(TYPE)_frontend.so
 
 T_FILES_FRONTEND=login.t login_hermes.t \
   frontend_login_error.t frontend_security.t frontend_session.t \
@@ -111,6 +115,12 @@ templates.a: $(O_FILES)
        rm -f templates.a
        ar q templates.a $(O_FILES)
 
+$(TYPE)_frontend.so: $(O_FILES_FRONTEND)
+       $(CC) $(LDFLAGS) -shared -o $@ $(O_FILES_FRONTEND)
+
+$(TYPE).so: $(O_FILES)
+       $(CC) $(LDFLAGS) -shared -o $@ $(O_FILES)
+
 %.o: %.c Makefile
        $(CC) $(CFLAGS) -I../../lib -c $<
 
@@ -129,6 +139,10 @@ install:
        cp *.t $(BROOT)$(PREFIX)/templates/$(TYPE)
        cp *.vars $(BROOT)$(PREFIX)/templates/$(TYPE)
 
+       $(INSTALL) -o $(RO_USER) -g $(RO_GROUP) -m $(PUBLIC_DIR) -d \
+         $(BROOT)$(LIB_PREFIX)/templates
+       cp *.so $(BROOT)$(LIB_PREFIX)/templates/
+
 clean:
        rm -f $(TARGETS) *.html *.o *.c \#*\# *~
 
--- a/templates/old/Makefile
+++ b/templates/old/Makefile
@@ -6,12 +6,16 @@ else
 include ../../Config
 endif
 
-CFLAGS  = $(BASECFLAGS)
-LDFLAGS = $(BASELDFLAGS)
+CFLAGS  = $(BASECFLAGS) -fPIC
+LDFLAGS = $(BASELDFLAGS) -fPIC
+LDFLAGS_TEMPLATELIB = \
+       -Wl,--defsym=template_map=template_map_$(TYPE) \
+       -Wl,--defsym=template_map_count=template_map_$(TYPE)_count
+LDFLAGS += $(LDFLAGS_TEMPLATELIB)
 
 TYPE=old
 
-TARGETS=templates.a templates_frontend.a
+TARGETS=templates.a templates_frontend.a $(TYPE).so $(TYPE)_frontend.so
 
 T_FILES_FRONTEND=login.t \
   frontend_login_error.t frontend_security.t frontend_session.t \
@@ -110,6 +114,12 @@ templates.a: $(O_FILES)
        rm -f templates.a
        ar q templates.a $(O_FILES)
 
+$(TYPE)_frontend.so: $(O_FILES_FRONTEND)
+       $(CC) $(LDFLAGS) -shared -o $@ $(O_FILES_FRONTEND)
+
+$(TYPE).so: $(O_FILES)
+       $(CC) $(LDFLAGS) -shared -o $@ $(O_FILES)
+
 %.o: %.c Makefile
        $(CC) $(CFLAGS) -I../../lib -c $<
 
@@ -128,6 +138,10 @@ install:
        cp *.t $(BROOT)$(PREFIX)/templates/$(TYPE)
        cp *.vars $(BROOT)$(PREFIX)/templates/$(TYPE)
 
+       $(INSTALL) -o $(RO_USER) -g $(RO_GROUP) -m $(PUBLIC_DIR) -d \
+         $(BROOT)$(LIB_PREFIX)/templates
+       cp *.so $(BROOT)$(LIB_PREFIX)/templates/
+
 clean:
        rm -f $(TARGETS) *.html *.o *.c \#*\# *~
 
--- a/servers/prayer_chroot.c
+++ b/servers/prayer_chroot.c
@@ -255,6 +255,8 @@ int main(int argc, char *argv[])
     if (list_length(prayer->http_port_list) == 0L)
         prayer_fatal(prayer, "No HTTP or HTTPS ports active");
 
+    dlopen_templates(config->template_set, "_frontend");
+
     if (config->prayer_background && !want_foreground) {
         pid_t pid = fork();
 
--- a/shared/Makefile
+++ b/shared/Makefile
@@ -33,7 +33,7 @@ MYCFLAGS  = $(BASECFLAGS)
 
 SHARED_OBJS = \
  config.o gzip.o html_common.o log.o \
- request.o response.o user_agent.o
+ request.o response.o user_agent.o dlopen_templates.o
 
 
 all: $(SHARED_OBJS)
--- a/servers/prayer_main.c
+++ b/servers/prayer_main.c
@@ -290,6 +290,8 @@ int main(int argc, char *argv[])
 
     prayer_log_open(prayer);
 
+    dlopen_templates(config->template_set, "_frontend");
+
     if (config->limit_vm)
         os_limit_vm(config->limit_vm);
 
--- a/shared/shared.h
+++ b/shared/shared.h
@@ -40,3 +40,4 @@ extern int errno;               /* just
 #include "setproctitle.h"
 #include "mymutex.h"
 #include "log.h"
+#include "dlopen_templates.h"
--- a/servers/Makefile
+++ b/servers/Makefile
@@ -60,8 +60,8 @@ ifeq ($(strip $(ACCOUNTD_ENABLE)), true)
   endif
 endif
 
-PRAYER_LIBS   = $(BASE_LIBS) $(SERVER_SSL_LIBS)
-SESSION_LIBS  = $(BASE_LIBS) $(CCLIENT_LIBS)
+PRAYER_LIBS   = $(BASE_LIBS) $(SERVER_SSL_LIBS) -ldl
+SESSION_LIBS  = $(BASE_LIBS) $(CCLIENT_LIBS) -ldl
 
 # Add SSL if c-client needs SSL
 ifeq ($(strip $(CCLIENT_SSL_ENABLE)), true)
@@ -90,15 +90,13 @@ TEMPLATES_FRONTEND= ../templates/index.o
  ../templates/cam/templates_frontend.a
 
 PRAYER_OBJS= prayer.o prayer_login.o prayer_server.o portlist.o \
-  ../shared/shared.a $(LIB) $(TEMPLATES_FRONTEND)
+  ../shared/shared.a $(LIB)
 
 SESSION_OBJS= \
    session_config.o session_exchange.o session_unix.o session_server.o \
    session_main.o portlist.o ../cmd/cmd.a ../session/session.a \
    ../shared/shared.a ../lib/lib_nossl.a
 
-SESSION_OBJS += $(TEMPLATES)
-
 #########################################################################
 
 all:   $(BIN)
--- a/Makefile
+++ b/Makefile
@@ -28,7 +28,7 @@ install-cert:
 install:
        $(MAKE) -C files install
        $(MAKE) -C man   install
-#      $(MAKE) -C templates install
+       $(MAKE) -C templates install
        $(MAKE) -C servers install
        $(MAKE) -C utils install
 ifeq ($(strip $(ACCOUNTD_ENABLE)), true)
--- a/servers/session_exchange.c
+++ b/servers/session_exchange.c
@@ -144,6 +144,8 @@ BOOL session_exchange(struct session * s
     else
         template_set = config->template_set;   /* Safe default */
 
+    dlopen_templates(template_set, "");
+
     /* Set up template_vars ready for dispatch */
     session->template_vals = tvals
         = template_vals_create(request->pool,
--- a/servers/prayer_shared.h
+++ b/servers/prayer_shared.h
@@ -44,3 +44,4 @@ extern int errno;               /* just
 #include "mymutex.h"
 #include "log.h"
 #include "utf8.h"
+#include "dlopen_templates.h"